BotCon 2004 had it, but it was not authorised or produced by Hasbro, like every other BotCon/Official Con toy. As such, it is not considered a legit Transformers product, but a custom job, kinda like the WST Dinobots.
People can be slow to respond, especially if they only stop by once a day, or don't have time to reply straight away. The private messages are pretty instant though, like a message posting.
The AM Breakdown did not have any story written up for it, and it's biocard was pretty much the same as its Gen1 biocard, with one added sentence to say that he didn't mind not being able to combine with the other STunticons anymore.
If you are trying to work out where it fits into the TFs universe, Breakdown probably became an Actionmaster when everyone else became Actionmasters. Just because it was released in 2004, doesn't mean it can't be from a series that was released around 1990.